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Federer targets Rio Olympics

Federer, who won doubles gold at Beijing in 2008 and singles silver in London this year, said he was already looking forward to a fifth Olympic appearance.

"I have to make sure that I take care of my schedule, of my body, of my mind," the 31-year-old Swiss told reporters in Sao Paulo.

"Hopefully I can still stay on tour for many more years and hopefully play the Olympics here in three-and-a-half years or so, so I have to look far ahead and not just the next six months.

"I'm not going to play 25 tournaments, but every tournament that I will be playing I'll be emotionally attached to it, because I either won there before or because I've been there many times or because I love the city or the country and the fans.

"Today I've reached a point in my life that I can pick and choose where I want to play and how much I want to play."